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Diffstat (limited to 'Build/source/libs/potrace/potrace-src/src/bitops.h')
-rw-r--r-- | Build/source/libs/potrace/potrace-src/src/bitops.h | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/Build/source/libs/potrace/potrace-src/src/bitops.h b/Build/source/libs/potrace/potrace-src/src/bitops.h deleted file mode 100644 index e7e7ed36247..00000000000 --- a/Build/source/libs/potrace/potrace-src/src/bitops.h +++ /dev/null @@ -1,83 +0,0 @@ -/* Copyright (C) 2001-2017 Peter Selinger. - This file is part of Potrace. It is free software and it is covered - by the GNU General Public License. See the file COPYING for details. */ - - -/* bits.h: this file defines some macros for bit manipulations. We - provide a generic implementation, as well as machine- and - compiler-specific fast implementations */ - -/* lobit: return the position of the rightmost "1" bit of an int, or - 32 if none. hibit: return 1 + the position of the leftmost "1" bit - of an int, or 0 if none. Note: these functions work on 32-bit - integers. */ - -#ifndef BITOPS_H -#define BITOPS_H - -#ifdef HAVE_CONFIG_H -#include <config.h> -#endif - -/* ---------------------------------------------------------------------- */ -/* machine specific macros */ - -#if defined(HAVE_I386) - -static inline unsigned int lobit(unsigned int x) { - unsigned int res; - asm ("bsf %1,%0\n\t" - "jnz 0f\n\t" - "movl $32,%0\n" - "0:" - : "=r" (res) - : "r" (x) - : "cc"); - return res; -} - -static inline unsigned int hibit(unsigned int x) { - unsigned int res; - - asm ("bsr %1,%0\n\t" - "jnz 0f\n\t" - "movl $-1,%0\n" - "0:" - : "=r" (res) - : "r" (x) - : "cc"); - return res+1; -} - -/* ---------------------------------------------------------------------- */ -#else /* generic macros */ - -static inline unsigned int lobit(unsigned int x) { - unsigned int res = 32; - while (x & 0xffffff) { - x <<= 8; - res -= 8; - } - while (x) { - x <<= 1; - res -= 1; - } - return res; -} - -static inline unsigned int hibit(unsigned int x) { - unsigned int res = 0; - while (x > 0xff) { - x >>= 8; - res += 8; - } - while (x) { - x >>= 1; - res += 1; - } - return res; -} - -#endif - -#endif /* BITOPS_H */ |